Cal. Gov. Code § 53502

In any ordinance, resolution, order or indenture providing for the issuance of general obligation bonds of a local agency to provide funds for the acquisition, construction or financing of a revenue producing facility or any addition to, or extension or improvement of a revenue-producing facility, the legislative body of the local agency may pledge all or any part of the revenues of such facility to the payment or security of such general obligation bonds and the interest thereon in such manner and upon such terms as the legislative body may deem advisable.